GORE-TEX® waterproof membrane, exceptional breathability and waterproof performance. Breathable mesh and TPU upper. 100% recycled breathable mesh lining. NXT lined footbed cover to prevent odor. 50% recycled removable EVA foam footbed. Molded nylon arch shank. Merrell Air Cushion in the heel absorbs shock and adds stability. Vibram® TC5 outsole.